Effect of organic montmorillonite on microstructure and properties of the OMMT/EVA/Asphalt composites

摘要

In order to improve the aging resistance and rutting resistance of the asphalt, a novel OMMT/EVA/asphalt composite was prepared by using organic montmorillonite (OMMT) and ethylene vinyl acetate (EVA) as modifiers via melt blending method. The microstructure and morphology of the EVA/asphalt composites and the OMMT/EVA/asphalt composites were characterized by X-ray diffraction (XRD) and fluorescence microscopy (FM), respectively. XRD patterns indicate that the layers of OMMT are peeled off, and an exfoliated structure is formed. FM images show that a network structure appears between EVA and asphalt. The properties of the OMMT/EVA/asphalt composites were investigated by storage stability test, rotating thin film oven test (RTFOT), and dynamic shear rheometer (DSR), respectively. The results show that OMMT/EVA/asphalt composites exhibit better storage stability and aging resistance than that of EVA-modified asphalt. Moreover, the obtained composites also show an increase in softening point and complex modulus (G*), and a decrease in penetration and phase angle (), which indicate that the OMMT/EVA/asphalt composites display good rutting resistance, high elasticity, and superior anti-cracking properties. POLYM. COMPOS., 39:1959-1966, 2018. (c) 2016 Society of Plastics Engineers